If you think you can do it, you can.
By failing to prepare, you are preparing to fail.
Leap, and the net will appear.
The wise does at once what the fool does at last.
Be gentle to all and stern with yourself.
The secret of getting ahead is getting started.
Well done is better than well said.
Who seeks shall find.
If you're going through hell, keep going.
Go for it now. The future is promised to no one.
I have taught history on the high school and college levels, and am or have been a lecturer at the Smithsonian, The National Institutes of Health, and numerous colleges and universities, mostly on science fiction and technology subjects.